New figures show fewer than half Northumberland adults have been seen by an NHS dentist in the last two years
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It is up from 43% in 2020-22 but below the rate before Covid-19 when 57% were seen in 2017-19.
British Dental Asssociation chairman Eddie Crouch said: "Demoralised dentists are walking away from a broken system, while millions struggle to access the care they need. NHS dentistry can come back from the brink, but only if ministers turn the page."
An NHS spokesperson said the figures show significant recovery in dental treatment for children since the pandemic. In Northumberland, 32,895 children were seen in the past year – covering 59% of under-18s in the area. The rate is up from 52% in 2021-22 but below 68% in 2018-19.
Louise Ansari, chief executive at Healthwatch England, said the new data backs up its claims "that people in every corner of England are struggling to get the dental treatment they need when they need it".
The figures also show the number of NHS dentists practising in England also fell year-on-year to 24,151 in 2022-23 from 24,272 in the previous year.
A Department of Health and Social Care spokesperson said: "We fund more than £3 billion of NHS dentistry a year, have announced plans to increase dental training places by 40% and last week we launched a consultation to better utilise the skills of dental hygienists and therapists."